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LGT2108 Geophone String
LGT2108 Geophone String

  Instruction:

LGT2108 Geophone String consist of robust Land plastic case, one meter cable, takeout clip, which can receive the vertical vibration. LGT2108 can be mounted with 4.5hz seismic geophone to 100hz seismic geophone.*      

  Features:
It features stable performance, high fidelity and consistent quality in conventional  industrial of coal, Petroleum and natual gas exploration. Today LGT2108 single seismic geophone strings are widely used in a various applications that are far removed from their original applications as earthquake detectors, engineering vabrations, perimeters defensing.
  Suitable  Seismic Geophones:

Type

LGT-20D4.5

LGT-20D10

LGT-20D14

LGT-20D28

Natural Frequency (Hz)

4.5 ± 0.5Hz

10 ± 5%

14 ± 5%

28 ± 5%

Open Circuit Damping

0.7 ± 5%

0.3 ± 5%

0.22 ± 5%

0.27 ± 5%

Damping with Shunt Resistance

 

0.7 ± 5%

0.51 ± 5%

0.552 ± 5%

Intrinsic Voltage Sensitivity (V/cm/s)

0.234 ± 5%

0.28 ± 5%

0.28 ± 5%

0.39 ± 5%

Sensitivity with Shunt Resistance(V/cm/s)

 

0.2 ± 5%

0.2 ± 5%

0.28 ± 5%

Coil Resistance

395 ± 5%

395 ± 5%

395 ± 5%

395 ± 5%

Close Circuit Resistance (Ω)

 

283 ± 5%

283 ± 5%

283 ± 5%

Harmonic Distortion 

≤0.3%

≤0.2%

≤0.2%

≤0.2%

Typical Spurious Frequency (Hz)

≥180

≥250

≥300

≥400

Moving Mass (g)

11.3

11

11

11

Coil Excursion P-P

1.5

1.5

1.5

1.5

Maintains Fn Specifications to Tilt Angle 

≤10

≤20

≤20

90

Core Unit Diameter (mm)

25.4

25.4

25.4

27

Core Unit Height (mm)

33.5

33.5

33.5

33.5

Core Unit Mass (g)

87

87

87

100

Operating Temperature()

-40 to +90

-40 to +90

-40 to +90

-40 to +90

Warranty (year)

1

3

3

3

 

Type

LGT-20D40

20DX60

20DX100

Natural Frequency(Hz)

40 ± 5%

60±5%

100 ± 5%

Open Circuit Damping

0.37 ± 5%

0.503±5%

0.464 ± 5%

Damping with Shunt Resistance

0.576 ± 5%

0.60±5%

0.65 ± 5% (1000 Ω)

Intrinsic Voltage Sensitivity(V/cm·s-1)

0.42 ± 5%

0.351±5%

0.612 ± 5%

Sensitivity with Shunt Resistance (V/cm·s-1)

0.304 ± 5% (1500)

0.27±5% (2000)

0.32 ± 5% (11000 Ω)

Close Circuit Resistance (Ω)

 

 

 

Coil Resistance (Ω)

575 ± 5%

600±5%

1004± 5% 

Distortion (%)

≤0.2%

0.2

0.2%

Typical Spurious Frequency (Hz)

≥400

 ≥550

≥ 600

Moving Mass (g)

8.2

6.5±5%

7.6±5%

Coil Excursion P-P

1.5

1.5

1.5mm

Maintains Fn Specifications to Tilt Angle

90

90°

90°

Core Unit Diameter (mm)

27

27

27

Core Unit Height (mm, )

33.5

33.5

33.5

Core Unit Mass (g)

100

95

95

Operating Temperature()

-40 to +90

-40 to +90

-40 to +90

Warranty(year)

3

2

2

 

*Longet Equipment Co., Ltd can customize different kind of seismic geophones to meet all the customer's various applications.

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